CCNA

IP Address Classes

ip address classes

There are two types of IP addresses  : Classless and classful. Classful IP addresses are the IP addresses that subnet masks are defined due to IP address interval. There are three types of IP Address Classes : A, B and C

 ip classes

Class A IP Address

When written in a binary format, the first (leftmost) bit of a Class A address is always 0.

•Example of a Class A IP address is 124.95.44.15.

•The first octet, 124, identifies the network number assigned by ARIN which will range from 0-126.

 (127 does start with a 0 bit, but has been reserved for special purposes.)

•The internal administrators of the network assign the remaining 24 bits

•All Class A IP addresses use only the first 8 bits to identify the network part of the address.

•Every network that uses a Class A IP address can have assigned up to 2 to-the-power of 24 (224

(minus 2), or 16,777,214, possible IP addresses to devices that are attached to its network 

Class B IP Address

•The first 2 bits of a Class B address are always 10 (one and zero).

•Example of a Class B IP address is 151.10.13.28

•The first two octets identify the network number assigned by ARIN•Class B IP addresses always have values ranging from 128 to 191 in their first octet•Every network that uses a Class B IP address can have assigned up to 2 to-the-power of 16 (216) (minus 2 again!), or 65,534, possible IP addresses to devices that are attached to its network

Class C IP Address

•The first 3 bits of a Class C address are always 110 (one, one and zero).

•An example of a Class C IP address is 201.110.213.28

•The first three octets identify the network number.

•Class C IP addresses always have values ranging from 192 to 223 in their first octet.

•All Class C IP addresses use the first 24 bits to identify the network part of the address

•Every network that uses a Class C IP address can have assigned up to 28 (minus 2), or 254, possible IP addresses to devices that are attached to its network 

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